WO2023206020A1

WO2023206020A1 - Overhang measurement method and apparatus for battery electrode plate, and device and storage medium

Info

Publication number: WO2023206020A1
Application number: PCT/CN2022/089070
Authority: WO
Inventors: 段彭飞; 陈琪; 王建磊; 戴亚; 雷扬
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-04-25
Filing date: 2022-04-25
Publication date: 2023-11-02
Also published as: EP4379893A1; KR102667112B1; CN117501507A; KR20240038147A; US20240202904A1

Abstract

Provided are an overhang measurement method and apparatus for a battery electrode plate, and a device and a storage medium. The overhang measurement method for a battery electrode plate comprises: acquiring an image of a battery electrode plate; determining the positions of a plurality of electrode plate sides in the image, wherein the plurality of electrode plate sides are electrode plate sides related to an overhang measurement value corresponding to the image, the position of each electrode plate side is determined on the basis of a region where the electrode plate side is located, and the region where the electrode plate side is located is a dynamically determined region; and according to the positions of the plurality of electrode plate sides, determining the overhang measurement value corresponding to the image. The measurement method is used for improving the flexibility and adaptability of overhang measurement.

Description

Overhang detection method, device, equipment and storage medium for battery pole pieces

Technical field

The present application relates to the technical field of battery detection, specifically, to an Overhang detection method, device, equipment and storage medium for battery pole pieces.

Background technique

The lamination machine is used for the lamination forming process of the battery. It can composite the cathode, anode and separator of the battery. For composite electrode pieces, it is necessary to measure the size of the Overhang (referring to the length and width of the negative electrode piece beyond the positive and negative electrode pieces) to determine whether the composite electrode piece meets the requirements.

The existing Overhang measurement technology uses the traditional fixed area straight line fitting scheme to locate each pole piece edge in the fixed area, and then determines the Overhang measurement value based on the positioning results of each pole piece edge. In this way, the positioning method relies on a fixed area and has poor flexibility; due to the poor flexibility, the adaptability is also poor in practical applications.

Contents of the invention

The purpose of this application is to provide an Overhang detection method, device, equipment, and storage medium for battery pole pieces to improve the flexibility and adaptability of Overhang measurement.

In a first aspect, this application provides a method for overhang detection of battery pole pieces, which includes: acquiring an image of a battery pole piece; determining the positions of multiple pole piece edges in the image; wherein the multiple pole piece edges are The pole piece edge related to the Overhang measurement value corresponding to the image; the position of each pole piece edge is determined based on the area where each pole piece edge is located, and the area where each pole piece edge is located is a dynamically determined area; according to the The positions of the plurality of pole piece edges determine the Overhang measurement value corresponding to the image.

In this application, when determining the position of each pole piece edge related to the Overhang measurement value corresponding to the image, it is determined based on the area where each pole piece edge is located; and the area where each pole piece edge is located is a dynamically determined area. Compared with the existing technology, the traditional fixed-area fitting straight line solution is no longer used, but the position of each pole piece edge is determined based on the dynamically determined area. Since the area is no longer fixed, the positioning of each pole piece edge is also more precise. Flexible, for example: there is no need to pre-demarcate the area where each pole piece edge is located. Therefore, this method can improve the flexibility of positioning of each pole piece edge, thereby improving the flexibility of Overhang measurement; on the basis of improved flexibility, the adaptability of Overhang measurement also increases accordingly, for example: positioning in a fixed area is not considered In this case, it can be adapted to Overhang measurement in more complex environments.

As a possible implementation manner, the area where each pole piece edge is located is an area determined based on preset area parameter information, or an area determined based on the position of one or more pole piece edges.

In this application, the area where each pole piece edge is located can be determined based on preset regional parameter information or based on the position of one or more pole piece edges, making the positioning method of each pole piece edge more flexible.

As a possible implementation, the image includes: a first pole piece edge and a second pole piece edge; the area where the first pole piece edge is located is determined based on preset area parameter information, and the second pole piece edge is located The area where the blade edge is located is determined based on the position of the first pole piece edge and a first positional relationship; the first positional relationship is the positional relationship between the first pole piece edge and the second pole piece edge.

In this application, for the first pole piece edge and the second pole piece edge, the area where the first pole piece edge is located can be determined based on the preset area parameters, and the area where the second pole piece edge is located is based on the first pole piece edge. The relationship between the position of the edge and the first position is determined, that is, the area where the pole piece edge is located can be flexibly determined in combination with the position of one pole piece edge, thereby improving the flexibility of pole piece edge positioning.

As a possible implementation manner, the image further includes: a third pole piece edge; the area where the third pole piece edge is located is based on the position of the first pole piece edge, the position of the second pole piece edge The position and the second position relationship are determined; the second position relationship is the position relationship between the first pole piece edge, the second pole piece edge and the third pole piece edge.

In this application, the area where the third pole piece edge is located is determined by combining the position of the first pole piece edge, the position of the second pole piece edge and the second position relationship. That is, the area where the pole piece edge is located can be determined by combining at least two pole pieces. The position of each pole piece edge is flexibly determined to improve the flexibility of pole piece edge positioning.

As a possible implementation, the image further includes: a fourth pole piece edge; the area where the fourth pole piece edge is located is based on the position of the first pole piece edge, the position of the second pole piece edge The position, the position of the third pole piece edge and the third position relationship are determined; the third position relationship is the first pole piece edge, the second pole piece edge, the third pole piece edge and all Describe the positional relationship between the edges of the fourth pole piece.

In this application, the area where the fourth pole piece edge is located is determined by combining the position of the first pole piece edge, the position of the second pole piece edge, the position of the third pole piece edge and the third position relationship, so that the pole piece edge The area can be flexibly determined by combining the positions of at least three pole piece edges to improve the flexibility of pole piece edge positioning.

As a possible implementation, the first pole piece side is a vertical cathode side, the second pole piece side includes: a vertical anode side and a horizontal cathode side, and the third pole piece side includes: a horizontal cathode side. The ceramic side and the horizontal diaphragm side, the fourth pole piece side is the horizontal anode side.

In this application, the pole piece edges related to Overhang's measurement values include: vertical cathode edge, vertical anode edge, horizontal cathode edge, horizontal cathode ceramic edge, horizontal diaphragm edge and horizontal anode edge, positioned based on the dynamic area In this way, the flexible positioning of these pole piece edges can be realized, and the measurement value of Overhang can be flexibly determined.

As a possible implementation, determining the measurement value of Overhang corresponding to the image based on the positions of multiple pole piece edges includes: determining the cathode based on the position of the horizontal cathode ceramic edge and the position of the horizontal diaphragm edge. The distance between the ceramic pole piece and the diaphragm; the distance between the anode and the diaphragm is determined according to the position of the horizontal anode side and the position of the horizontal diaphragm side; the distance between the anode and the diaphragm is determined according to the position of the horizontal cathode side and the position of the horizontal anode side. The position determines the first spacing between the cathode and the anode; the second spacing between the cathode and the anode is determined according to the position of the vertical cathode side and the position of the vertical anode side; and the second spacing between the cathode and the anode is determined according to the position of the horizontal anode side and The position of the horizontal cathode ceramic edge determines the distance between the anode and the cathode ceramic pole piece; the width of the cathode plate is determined according to the position of the vertical cathode edge; the width of the anode plate is determined according to the position of the vertical anode edge; The distance between the cathode ceramic pole piece and the diaphragm, the distance between the anode and the diaphragm, the first distance, the second distance, the distance between the anode and the cathode ceramic pole piece, the cathode The plate width and the anode plate width determine the measurement of Overhang corresponding to the image.

In this application, by determining the spacing between the cathode ceramic pole piece and the separator, the spacing between the anode and the separator, the first spacing, the second spacing, the spacing between the anode and the cathode ceramic pole piece, the cathode sheet width and the anode slice width to achieve accurate determination of the measurement value of the Overhang corresponding to the image.

As a possible implementation, the image includes multiple images of the battery pole piece, and the multiple images respectively correspond to different areas of the battery pole piece; the detection method further includes: based on the multiple images, respectively The corresponding measurement value of Overhang and the positional relationship between the different areas determine the measurement value of Overhang corresponding to the battery pole piece.

In this application, images of different areas of the battery pole pieces are collected, and then the corresponding Overhang measurement values are determined respectively. Compared with the method of determining the overall image, on the one hand, the image processing method is more flexible; on the other hand, the fine-grained The image processing accuracy is higher, and the final measurement results are more accurate.

As a possible implementation manner, the multiple images respectively correspond to the four corner areas of the battery pole piece.

In this application, the four corner areas of the battery pole pieces are symmetrical, which not only ensures the versatility or consistency of each image processing method, but also facilitates the determination of the Overhang measurement value of the battery pole piece based on the Overhang measurement values of multiple images. .

As a possible implementation method, for any pole piece edge, the determination process of the position of the pole piece edge includes: determining the edge transition point in the area where the pole piece edge is located based on the position of the area where the pole piece edge is located. The position of the pole piece edge is determined based on the position of the edge transition point and the straight line fitting algorithm.

In this application, based on the dynamically determined area of each pole piece edge, the position of the edge transition point in the area where the pole piece edge is located is first determined, and then the position of the pole piece edge is realized based on the position of the edge transition point and the straight line fitting algorithm. effective and accurate positioning.

In a second aspect, the present application provides an Overhang detection device for battery pole pieces, including: each method for implementing the Overhang detection method of battery pole pieces described in the first aspect and any possible implementation of the first aspect. functional module.

In a third aspect, the present application provides an Overhang detection device for battery pole pieces, including: a processor; and a memory communicatively connected to the processor; the memory stores instructions that can be executed by the processor, and the The instructions are executed by the processor, so that the processor can perform the overhang detection method of the battery pole piece as described in the first aspect and any possible implementation of the first aspect.

In a fourth aspect, the present application provides a computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is run by a computer, it executes any one of the first aspect and the first aspect. The overhang detection method of battery pole pieces described in Possible Implementation Modes.

Description of the drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, therefore This should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of an image acquisition device provided by an embodiment of the present application;

Figure 2 is a first example of an image provided by an embodiment of the present application;

Figure 3 is a second example of an image provided by an embodiment of the present application;

Figure 4 is a flow chart of the Overhang detection method of battery pole pieces provided by the embodiment of the present application;

Figure 5 is a schematic structural diagram of an Overhang detection device for battery pole pieces provided by an embodiment of the present application;

FIG. 6 is a schematic structural diagram of an Overhang detection device for battery pole pieces provided by an embodiment of the present application.

Icon: 100-image acquisition device; 101-camera; 102-light source; 103-plywood; 600-overhang detection device of battery pole piece; 510-acquisition module; 520-position determination module; 530-measurement value determination module; 600- Overhang testing equipment for battery pole pieces; 610-processor; 620-memory.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solution of the present application more clearly, and are therefore only used as examples and cannot be used to limit the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the technical field belonging to this application; the terms used herein are for the purpose of describing specific embodiments only and are not intended to be used in Limitation of this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

In the description of the embodiments of this application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying the relative importance or implicitly indicating the quantity or specificity of the indicated technical features. Sequence or priority relationship. In the description of the embodiments of this application, "plurality" means two or more, unless otherwise explicitly and specifically limited.

Reference herein to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of this application, the term "and/or" is only an association relationship describing associated objects, indicating that there can be three relationships, such as A and/or B, which can mean: A exists alone, and A exists simultaneously and B, there are three cases of B alone. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

In the description of the embodiments of this application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to It is more than two pieces (including two pieces).

At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydraulic, thermal, wind and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. As the application fields of power batteries continue to expand, their market demand is also constantly expanding.

As the application of batteries becomes more widespread, battery production technology is also constantly developing. At present, battery processes mainly include winding and lamination, which involve combining the cathode, anode and separator of the battery to obtain a composite electrode piece. For this composite pole piece, the Overhang size needs to be measured.

In the existing Overhang measurement technology, the traditional fixed area straight line fitting scheme is used to locate each pole piece edge in the fixed area, and then determine the Overhang measurement value based on the positioning results of each pole piece edge. For example: collecting an image of a battery pole piece, the area where the anode edge is located and the area where the cathode edge is located are pre-fixed areas in the image; then perform straight line fitting in the fixed area where the anode edge is located, and locate the anode edge; and Perform straight line fitting in the fixed area where the cathode edge is located to locate the cathode edge; finally, use the positioning results of the anode edge and the positioning results of the cathode edge to determine the Overhang measurement value.

The applicant found that although this measurement method can realize the measurement of Overhang, due to its use of a fixed area for pole piece edge positioning, the measurement of Overhang has poor flexibility and poor adaptability. For example: this measurement method is only suitable for offline measurement and cannot be used for online measurement in the battery process. Another example: the image collection method of this measurement method is limited. It can only collect images based on a fixed area, and cannot flexibly change the image collection method, so it cannot be applied to complex environments.

After careful consideration by the applicant, the essential reason why the above-mentioned measurement method has poor flexibility and adaptability is: positioning based on a fixed area. For example: Since positioning needs to be based on a fixed area, if online measurement is used, the fixed area may not be accurately positioned, so offline measurement can only be used. Another example: Since positioning needs to be based on a fixed area, the collected images must include a fixed area. Therefore, images can only be collected based on a fixed area, and the image collection method cannot be changed arbitrarily and applied to complex environments.

Then, if the positioning of each pole edge no longer relies on fixed areas, but on flexible areas, it will not be restricted by fixed areas, greatly improving flexibility and adaptability.

Based on the above considerations, the applicant designed a technical solution to reduce the limitations of Overhang measurement and improve the flexibility and adaptability of Overhang measurement.

In this technical solution, the traditional fixed-area fitting straight line solution is no longer used, but the position of each pole piece edge is determined based on a dynamically determined area. Since the area is no longer fixed, the positioning of each pole piece edge is also more flexible. For example, there is no need to pre-define the area where each pole piece edge is located, and it is suitable for both offline and online measurements.

Therefore, this method can improve the flexibility of positioning of each pole piece edge, thereby improving the flexibility of Overhang measurement; on the basis of improved flexibility, the adaptability of Overhang measurement also increases accordingly, for example: positioning in a fixed area is not considered In this case, the image collection method is also more flexible and can be adapted to Overhang measurements in more complex environments.

The technical solution provided by the embodiment of the present application can be used in the battery manufacturing process, including the lamination process and the winding process. The Overhang of the composite battery pole piece is measured. The measured value of the Overhang can be used to determine whether the composite battery pole piece meets the specification.

The technical solutions provided by the embodiments of this application can be applied to the Overhang detection system of battery pole pieces. The detection system can be a part of the laminating machine or winding machine, or it can be a part independent of the laminating machine or winding machine. .

The battery pole piece Overhang detection system may include a battery pole piece Overhang detection device and an image acquisition device, and there is a communication connection between the battery pole piece Overhang detection device and the image acquisition device.

The image acquisition device is used to collect images of battery pole pieces, and the Overhang detection equipment is used to control the image acquisition device, and implement Overhang measurement based on the images collected by the image acquisition device. Of course, in some embodiments, the control of the image acquisition device can also be implemented by other control devices, and is not limited to being implemented by the Overhang detection device. Moreover, Overhang detection equipment can be understood as an intelligent device with data processing capabilities and data storage capabilities, or an intelligent controller, an intelligent processor, etc.

Please refer to FIG. 1 , which is a schematic structural diagram of an image acquisition device provided by an embodiment of the present application. The image acquisition device includes: a camera 101 , a light source 102 and a splint 103 .

The technical solution provided by the embodiment of the present application is used to perform Overhang detection on the compounded pole pieces. In the battery manufacturing process, after the battery pole pieces are compounded, they will be sent to the next processing node, that is, the compounded battery pole pieces Move along the preset movement direction.

For the composite battery pole piece, including the front and back sides, the pole piece structure is: cathode, separator, anode, separator, cathode. Moreover, in the preset moving direction, the cathodes are separate sheet-like structures.

Therefore, a part of the splint 103 is set on the front side of the pole piece, and the other part is set on the reverse side of the pole piece. When an image needs to be collected, the corresponding control device controls the two parts of the splint 103 to clamp the pole piece to achieve image stability. collection.

Since the structure of the front and back sides of the pole piece is symmetrical, Overhang measurement can be achieved by collecting images from the front side or from the back side. In some embodiments, the camera 101 may include a front camera module and/or a rear camera module (a front camera module and a rear camera module are included in FIG. 1 ).

Correspondingly, when the camera 101 includes a front camera module, the light source 102 includes the light source of the front camera module; when the camera 101 includes a rear camera module, the light source 102 includes the light source of the rear camera module; the camera 101 includes a front camera module and a rear camera module. When using a camera module, the light source 102 includes the light source of the front camera module and the light source of the rear camera module. In Figure 1, the light source of the front camera module includes the front light source and the back light source, and the light source of the back camera module also includes the front light source and the back light source.

The light source 102 is used to light the pole piece so that the camera can collect images. The front light source is used for front lighting, and the reverse light source is used for back lighting. It can be a flashlight, lighting, etc., which is not limited here.

Moreover, using the technical solutions of the embodiments of the present application, the front camera module and/or the back camera module can be equipped with one camera or multiple cameras.

If a camera 101 is provided, the camera 101 is used to collect a complete image of the battery pole piece corresponding to the above-mentioned piece of cathode. The camera 101 can be a large field of view line array camera that meets the frame rate requirements.

If multiple cameras 101 are provided, the multiple cameras 101 are respectively used to collect images of different fields of view of the battery pole piece corresponding to one cathode, for example, images of the four corner areas. At this time, the multiple cameras 101 may be high frame rate small field of view area scan cameras.

For ease of understanding, please refer to Figures 2 and 3. If one camera 101 is set up, the collected images can be as shown in Figure 2. In Figure 2, multiple fields of view are included, and images of multiple fields of view can be collected by multiple cameras. ; If multiple cameras 101 are provided, the collected images are images of different fields of view based on the overall image in Figure 2. As shown in Figure 3, it is an image of field of view 3. It should be noted that if there is only one camera 101, there should be only one field of view, which includes a complete image of the pole piece; the field of view marked in Figure 2 is only to facilitate understanding of the correspondence between Figure 3 and Field of View 3.

Based on the introduction of the above inventive concepts and application scenarios, please refer to Figure 4, which is a flow chart of the Overhang detection method of the battery pole piece provided by the embodiment of the present application. The detection method includes:

Step 410: Obtain an image of the battery pole piece.

Step 420: Determine the positions of multiple pole piece edges in the image. Among them, the plurality of pole piece edges are pole piece edges related to the Overhang measurement value corresponding to the image; the position of each pole piece edge is determined based on the area where each pole piece edge is located, and the area where each pole piece edge is located is a dynamically determined area.

Step 430: Determine the Overhang measurement value corresponding to the image based on the positions of multiple pole piece edges.

Based on the introduction of the above application scenarios, in step 410, the image of the battery pole piece can be an image of a complete battery pole piece, or it can be an image of different areas (different fields of view) of the battery pole piece.

Correspondingly, the image in step 410 may be one image or multiple images. Whether it is one image or multiple images, the corresponding image processing methods are the same.

In conjunction with the foregoing introduction of the image acquisition device, in step 410, images sent by the front camera module and/or the rear camera module are received.

In step 420, the positions of multiple pole piece edges in the image are determined, and the multiple pole piece edges are pole piece edges related to the Overhang measurement value corresponding to the image.

It can be understood that since the images acquired in step 410 may be multiple images, the multiple images correspond to different fields of view of the battery pole pieces. In this case, the Overhang measurement value determined based on the image cannot represent the final Overhang measurement value. The final Overhang measurement value needs to be determined based on the Overhang measurement values determined separately from multiple images. Therefore, in step 420, multiple Overhang measurement values will be determined. A pole edge is defined as the pole edge associated with the corresponding Overhang measurement of the image.

In the embodiment of the present application, the position of each pole piece edge is determined based on the area where each pole piece edge is located, and the area where each pole piece edge is located is a dynamically determined area. Since the dynamic determination of the regions where some pole piece edges are located may need to be combined with the position determination of other pole pieces, in this embodiment of the present application, the determination of the region and the positioning based on the region are integrated into step 420. In fact, it should be understood that every time the area where a pole piece edge is located is determined, the position of the pole piece edge will be determined based on the area where the pole piece edge is located. That is, during the positioning process of the pole piece edge, along with the pole piece edge Dynamic determination of edge regions.

In step 430, the Overhang measurement value corresponding to the image is determined based on the positions of the plurality of pole piece edges. When step 410 and step 420 adopt different implementation modes, step 430 may also have multiple implementation modes, which will be introduced in detail in subsequent embodiments.

In the embodiment of the present application, when determining the position of each pole piece edge related to the Overhang measurement value corresponding to the image, it is determined based on the area where each pole piece edge is located; and the area where each pole piece edge is located is a dynamically determined area. . Compared with the existing technology, the traditional fixed-area fitting straight line solution is no longer used, but the position of each pole piece edge is determined based on the dynamically determined area. Since the area is no longer fixed, the positioning of each pole piece edge is also more precise. Flexible, for example: there is no need to pre-demarcate the area where each pole piece edge is located. Therefore, this method can improve the flexibility of positioning of each pole piece edge, thereby improving the flexibility of Overhang measurement; on the basis of improved flexibility, the adaptability of Overhang measurement also improves, for example: when positioning in a fixed area is not considered In this case, it can be adapted to Overhang measurements in more complex environments.

As an optional implementation, in step 420, the area where each pole piece edge is located is an area determined based on preset area parameter information, or an area determined based on the position of one or more pole piece edges.

The preset area parameter information is the parameter information used to locate the area, such as: pixel coordinates of area boundary points, area length, area width, etc.

In some embodiments, the area where the first pole piece edge whose position is to be determined among the plurality of pole piece edges is located is determined based on preset regional parameter information, and the pole piece edges whose positions are to be determined after the first pole piece edge are The area is determined based on the position of the first pole piece edge whose position is to be determined, or combined with the positions of multiple pole piece edges whose positions have been determined.

In the embodiment of the present application, the area where each pole piece edge is located can be determined based on preset area parameter information or based on the position of one or more pole piece edges, making the positioning method of each pole piece edge more flexible.

As an optional implementation manner, the image includes: a first pole piece edge and a second pole piece edge; the area where the first pole piece edge is located is determined based on preset area parameter information, and the area where the second pole piece edge is located is determined based on The position of the first pole piece edge is determined by the first positional relationship; the first positional relationship is the positional relationship between the first pole piece edge and the second pole piece edge.

The first pole piece edge can be understood as the first pole piece edge whose position is to be determined, and the second pole piece edge can be understood as the second pole piece edge whose position is to be determined.

Correspondingly, for the first pole piece edge, the position determination process includes: determining the area where the first pole piece edge is located based on the preset area parameter information; determining the location of the first pole piece edge based on the area where the first pole piece edge is located. .

For the second pole piece edge, the position determination process includes: determining the area where the second pole piece edge is located based on the position of the first pole piece edge and the first position relationship; determining the second pole piece edge based on the area where the second pole piece edge is located. edge position.

The first positional relationship is the positional relationship between the first pole piece edge and the second pole piece edge, for example: the first pole piece edge is to the left, above the second pole piece edge, etc. Based on this positional relationship, after the position of the first pole piece edge is determined, the area where the second pole piece edge is located can also be determined. For example: if the first pole piece edge is above the second pole piece edge, then the area where the second pole piece edge is located is the area below the first pole piece edge.

In the embodiment of the present application, for the first pole piece edge and the second pole piece edge, the area where the first pole piece edge is located can be determined based on the preset area parameters, and the area where the second pole piece edge is located is based on the first The position of the pole piece edge is determined in relation to the first position, that is, the area where the pole piece edge is located can be flexibly determined based on the position of one pole piece edge, thereby improving the flexibility of pole piece edge positioning.

As an optional method, the image may also include: a third pole piece edge; the area where the third pole piece edge is located is determined based on the position of the first pole piece edge, the position of the second pole piece edge, and the second position relationship. ; The second positional relationship is the positional relationship between the first pole piece edge, the second pole piece edge and the third pole piece edge.

The third pole piece edge can be understood as the pole piece edge whose position is to be determined after the second pole piece edge, and the area where the pole piece edge is located needs to be determined based on the positions of the first pole piece edge and the second pole piece edge.

Correspondingly, the process of determining the position of the third pole piece edge includes: determining the area where the third pole piece edge is located based on the position of the first pole piece edge, the position of the second pole piece edge and the second position relationship; The area where the chip edge is located determines the position of the third pole chip edge.

The second positional relationship is the positional relationship between the first pole piece edge, the second pole piece edge and the third pole piece edge. For example: the third pole piece is below the first pole piece and to the left of the second pole piece. Based on this positional relationship, after the positions of the first pole piece edge and the second pole piece edge are determined, the area where the third pole piece edge is located can also be determined. For example, if the third pole edge is below the first pole edge and to the left of the second pole edge, then the area where the third pole edge is located is below the first pole edge and is on the left of the second pole edge. To the left of where the edge of the diode is located.

In the embodiment of the present application, the area where the third pole piece edge is located is determined by combining the position of the first pole piece edge, the position of the second pole piece edge and the second position relationship. That is, the area where the pole piece edge is located can be determined by combining The positions of at least two pole piece edges are flexibly determined to improve the flexibility of pole piece edge positioning.

As an optional implementation, the image may also include: the fourth pole piece edge; the area where the fourth pole piece edge is located is based on the position of the first pole piece edge, the position of the second pole piece edge, the third pole piece edge The position of the edge and the third position relationship are determined; the third position relationship is the position relationship between the first pole piece edge, the second pole piece edge, the third pole piece edge and the fourth pole piece edge.

The fourth pole piece edge can be understood as the pole piece edge whose position is to be determined after the third pole piece edge, and the area where this pole piece edge is located combines the position of the first pole piece edge and the position of the second pole piece edge. , the relationship between the position of the third pole piece edge and the third position is determined.

Correspondingly, the process of determining the position of the fourth pole piece edge includes: determining the location of the fourth pole piece edge based on the position of the first pole piece edge, the position of the second pole piece edge, the position of the third pole piece edge and the third position relationship. area; determine the position of the fourth pole edge according to the area where the fourth pole edge is located.

Wherein, the third positional relationship is the positional relationship between the first pole piece edge, the second pole piece edge, the third pole piece edge and the fourth pole piece edge. For example: the fourth pole piece is below the first pole piece, to the left of the second pole piece, and above the third pole piece. Based on this positional relationship, when the positions of the first pole piece edge, the second pole piece edge and the third pole piece edge are determined, the area where the fourth pole piece edge is located can also be determined. For example: the area where the fourth pole edge is located is below the location of the first pole edge, to the left of the location of the second pole edge, and above the location of the third pole edge.

In the embodiment of the present application, the area where the fourth pole piece edge is located is determined based on the position of the first pole piece edge, the position of the second pole piece edge, the position of the third pole piece edge and the third position relationship, so that the pole piece edge is The area where the blade edge is located can be flexibly determined by combining the positions of at least three pole piece edges, thereby improving the flexibility of pole piece edge positioning.

It can be understood that when more pole piece edges are involved, the area where the pole piece edges are located can also be determined based on the positions of more pole piece edges, which is not limited here.

As an optional implementation, the first pole edge is a vertical cathode edge, the second pole edge includes: a vertical anode edge and a horizontal cathode edge, and the third pole edge includes: a horizontal cathode ceramic edge and a horizontal separator. The side of the fourth pole piece is the horizontal anode side.

This implementation can be used as the implementation of each pole piece edge corresponding to the image shown in Figure 3. That is, when the image in step 410 is the image shown in Figure 3, each pole piece edge is the implementation of this implementation. Each of the poles described above.

In this implementation, in step 420, the area where the vertical cathode edge is located is first determined based on the preset area parameter information, and then the position of the vertical cathode edge is determined based on the area where the vertical cathode edge is located. Next, determine the area where the vertical anode edge is located based on the position of the vertical cathode edge and the positional relationship between the vertical cathode edge and the vertical anode edge, and determine the location of the vertical anode edge based on the area where the vertical anode edge is located; and The area where the horizontal cathode edge is located is determined based on the position of the vertical cathode edge and the positional relationship between the vertical cathode edge and the horizontal cathode edge, and the position of the horizontal cathode edge is determined based on the area where the horizontal cathode edge is located.

Then, the level is determined based on the position of the vertical cathode edge, the position of the vertical anode edge and/or the horizontal cathode edge, and the positional relationship between the vertical cathode edge, the vertical anode edge and/or the horizontal cathode edge and the horizontal cathode ceramic edge. The area where the cathode ceramic edge is located determines the position of the horizontal cathode ceramic cup based on the area where the horizontal cathode ceramic edge is located. The position determination process of the horizontal diaphragm edge refers to the position determination process of the horizontal cathode ceramic edge, which will not be described again here.

Then, based on the position of the vertical cathode side, the position of at least one of the vertical anode side and the horizontal cathode side, the position of at least one of the horizontal cathode ceramic side and the horizontal separator side, and the vertical cathode The positional relationship between the edge, at least one pole piece edge among the vertical anode edge and the horizontal cathode edge, at least one pole piece edge among the horizontal cathode ceramic edge and the horizontal diaphragm edge, and the horizontal anode edge determines the area where the horizontal anode edge is located , determine the position of the horizontal anode edge according to the area where the horizontal anode edge is located.

In the embodiment of this application, the pole piece edges related to the measurement value of Overhang include: vertical cathode edge, vertical anode edge, horizontal cathode edge, horizontal cathode ceramic edge, horizontal diaphragm edge and horizontal anode edge, based on the dynamic area. The positioning method realizes the flexible positioning of these pole piece edges, thereby realizing the flexible determination of the measurement value of Overhang.

Further, based on the above-mentioned respective pole piece edges, as an optional implementation, step 430 includes: determining the distance between the cathode ceramic pole piece and the separator according to the position of the horizontal cathode ceramic edge and the position of the horizontal separator edge; The position of the horizontal anode side and the position of the horizontal diaphragm side determine the distance between the anode and the diaphragm; the first distance between the cathode and the anode is determined according to the position of the horizontal cathode side and the position of the horizontal anode side; according to the position of the vertical cathode side and the position of the vertical anode edge to determine the second distance between the cathode and the anode; determine the distance between the anode and the cathode ceramic pole piece according to the position of the horizontal anode edge and the position of the horizontal cathode ceramic edge; determine the second distance between the cathode and the anode according to the position of the vertical cathode edge Determine the width of the cathode piece; determine the width of the anode piece according to the position of the vertical anode edge; determine the width of the anode piece according to the distance between the cathode ceramic pole piece and the diaphragm, the distance between the anode and the diaphragm, the first distance, the second distance, the anode and the cathode ceramic pole The spacing between the plates, the width of the cathode plate, and the width of the anode plate determine the measurement of the Overhang corresponding to the image.

This implementation can be used as an implementation for determining the measurement value of Overhang corresponding to the image shown in FIG. 3 , that is, when the image in step 410 is the image shown in FIG. 3 , the method for determining the measurement value of the corresponding Overhang. .

In the embodiment of the present application, the measurement value of Overhang may not refer to a specific value, but to the value of related measurement items, that is, to the above-mentioned spacing between the cathode ceramic pole piece and the separator, the anode and the separator. Any one or more of the spacing between separators, the first spacing, the second spacing, the spacing between the anode and the cathode ceramic pole pieces, the width of the cathode piece and the width of the anode piece.

Based on these measurement values, integration can be performed to determine the final Overhang measurement value; of course, these measurement values can also be directly used as the final Overhang measurement value. Correspondingly, when making an evaluation based on the measurement value of Overhang, the measurement value of the integrated Overhang can be compared with the measurement value of the standard integrated Overhang to evaluate whether the composite battery pole piece meets the specifications. Each measurement value can also be compared with the corresponding standard measurement value, and multiple comparison results can be combined to evaluate whether the battery pole piece meets the specifications.

Wherein, the distance between the edge of the cathode ceramic pole piece and the separator may be the distance in the vertical direction between the edge of the cathode ceramic pole piece and the separator. The distance between the anode and the separator may be the distance between the anode and the separator in the vertical direction. The first distance between the cathode and the anode may be the distance between the horizontal cathode side and the horizontal anode side in the vertical direction. The second distance between the cathode and the anode may be the distance between the vertical cathode side and the vertical anode side in the horizontal direction. The distance between the anode and cathode ceramic pole pieces may be the vertical distance between the horizontal anode edge and the cathode ceramic pole edge.

In some embodiments, the width of the cathode sheet is the distance between the position of the vertical cathode edge in an image symmetrical to FIG. 3 (image with symmetrical field of view) and the position of the vertical cathode edge in FIG. 3 . And, the width of the anode sheet is the distance between the position of the vertical anode side in the image that is symmetrical to FIG. 3 and the position of the vertical anode side in FIG. 3 .

Of course, if the image includes vertical cathode edges on both sides or vertical anode edges on both sides, the width of the cathode sheet can be determined directly based on the positions of the vertical cathode edges on both sides, and the width of the cathode sheet can be determined based on the vertical anode edges on both sides. Anode plate width.

In the embodiment of the present application, by determining the distance between the cathode ceramic pole piece and the separator, the distance between the anode and the separator, the first distance, the second distance, the distance between the anode and the cathode ceramic pole piece, the width of the cathode piece and anode sheet width to achieve accurate determination of the measurement value of Overhang corresponding to the image.

As mentioned in the previous embodiment, the image in step 410 may include multiple images, which correspond to different areas of the battery pole piece. In this implementation, after step 430, the detection method also includes: The measured value of Overhang corresponding to the battery pole piece is determined based on the measured values of Overhang corresponding to the multiple images and the positional relationship between different areas.

According to the positional relationship between different areas, the integration method of the Overhang measurement values corresponding to different images can be determined.

In some embodiments, if different areas are symmetrical areas, the measurement values corresponding to different images may be integrated in a manner such as adding or adding and then dividing by a preset value.

In other embodiments, if different areas are asymmetric areas, the measurement values corresponding to different images may be integrated in a manner such as: weighted average, weighted sum, etc.

It can be understood that the specific integration method can be combined with specific application scenarios and set flexibly, and is not limited here. Moreover, the integration method to be adopted can be determined through advance data simulation, data testing, etc.

In the embodiment of this application, images of different areas of the battery pole pieces are collected, and then the corresponding Overhang measurement values are determined respectively. Compared with the method of determining the overall image, on the one hand, the image processing method is more flexible; on the other hand, Fine-grained image processing results in higher precision, and the final measurement results are more accurate.

As an optional implementation, the multiple images respectively correspond to the four corner areas of the battery pole piece.

In this embodiment, the four corner areas of the battery pole piece, that is, the images of the battery pole piece in the four corner fields of view are collected. The image collected in one of the fields of view can be referred to the aforementioned figure 3.

In the embodiment of the present application, the four corner areas of the battery pole pieces are symmetrical, which not only ensures the versatility or consistency of each image processing method, but also facilitates the determination of the Overhang of the battery pole piece based on the measured values of the Overhang of multiple images. Measurements.

In other embodiments, multiple images may also correspond to any two diagonal areas of the battery pole piece, or the area where the designated position is located, etc., which are not limited in the embodiments of the present application.

As an optional implementation, based on the determination of the area where the pole piece edge is located, the position determination process of the pole piece edge may include: determining the location of the pole piece edge based on the location of the area where the pole piece edge is located. The position of the edge transition point in the region; the position of the pole piece edge is determined based on the position of the edge transition point and the straight line fitting algorithm.

In this embodiment, the positioning of the pole piece edges is achieved using straight line fitting. It can be understood that the edge of the pole piece is a straight line in the image. After the area where the straight line is located is determined, the edge transition point can be located in the area where the straight line is located by binary whitening to find black. The positioning is The location of the edge transition point is the approximate location of the straight line. However, since the edge transition points may not be on a straight line, it is also necessary to use a straight line fitting algorithm to perform straight line fitting on these edge transition points to accurately locate the position of the pole piece edge.

In some embodiments, the straight line fitting algorithm may be the least squares method. Of course, other straight line fitting algorithms can also be used, which are not limited here.

In some embodiments, for the aforementioned first pole piece edge, before determining the edge transition point, a rough regional positioning can be performed based on the area where the first pole piece edge is located to find the area of interest, and then Determine edge transition points based on regions of interest.

In the embodiment of the present application, based on the dynamically determined area of each pole piece edge, the position of the edge transition point in the area where the pole piece edge is located is first determined, and then the pole piece edge is realized based on the position of the edge transition point and the straight line fitting algorithm. Effective and accurate positioning of the location.

It can be understood that based on the area where the pole piece edge is located, other feasible linear positioning methods can also be used to position the pole piece edge. For example, refer to the method of fitting the position of the pole piece edge based on a fixed area, which will not be discussed here. limited.

Please refer to Figure 5. The embodiment of the present application also provides an Overhang detection device 500 for battery pole pieces. The Overhang detection device 500 for battery pole pieces corresponds to the aforementioned Overhang detection method for battery pole pieces and includes: an acquisition module 510, a position Determination module 520 and measurement value determination module 530.

The acquisition module 510 is used to acquire the image of the battery pole piece; the position determination module 520 is used to determine the positions of multiple pole piece edges in the image; wherein the multiple pole piece edges are corresponding to the image. Overhang the pole piece edge related to the measured value; the position of each pole piece edge is determined based on the area where each pole piece edge is located, and the area where each pole piece edge is located is a dynamically determined area; the measurement value determination module 530 is used to The Overhang measurement value corresponding to the image is determined according to the positions of the plurality of pole piece edges.

In the embodiment of the present application, the measurement value determination module 530 is specifically used to: determine the distance between the cathode ceramic pole piece and the separator according to the position of the horizontal cathode ceramic edge and the position of the horizontal diaphragm edge; The position of the side and the position of the horizontal diaphragm side determine the distance between the anode and the diaphragm; the first distance between the cathode and the anode is determined according to the position of the horizontal cathode side and the position of the horizontal anode side; according to the The position of the vertical cathode side and the position of the vertical anode side determine the second distance between the cathode and the anode; the anode and the cathode ceramic pole piece are determined based on the position of the horizontal anode side and the position of the horizontal cathode ceramic side. The width of the cathode sheet is determined based on the position of the vertical cathode edge; the width of the anode sheet is determined based on the position of the vertical anode edge; the width of the anode sheet is determined based on the distance between the cathode ceramic pole piece and the separator, the anode The distance between the diaphragm, the first distance, the second distance, the distance between the anode and cathode ceramic pole pieces, the width of the cathode piece and the width of the anode piece determine the Overhang corresponding to the image. measurement value.

In this embodiment of the present application, the measurement value determination module 530 is further configured to determine the measurement value of the Overhang corresponding to the battery pole piece based on the measurement values of the Overhang corresponding to the multiple images and the positional relationship between the different areas.

In the embodiment of the present application, for any pole piece edge, the position determination module 520 is specifically used to: determine the position of the edge transition point in the area where the pole piece edge is located based on the location of the area where the pole piece edge is located; The position of the edge transition point and the straight line fitting algorithm determine the position of the pole piece edge.

Since the battery pole piece overhang detection device 500 corresponds to the battery pole piece overhang detection method, the implementation and technical effects of each functional module are also referred to the implementation and technical effects of the aforementioned detection method, and will not be repeated here.

Based on the same inventive concept, please refer to Figure 6. The embodiment of the present application also provides an Overhang detection device 600 for battery pole pieces, which can be used as the execution subject of the aforementioned detection method, including: a processor 610; and a communication connection with the processor 610 The memory 620; the memory 620 stores instructions that can be executed by the processor 610, and the instructions are executed by the processor 610, so that the processor 610 can perform the overhang detection method of the battery pole piece described in the previous embodiment.

The communication connection between the processor 610 and the memory 620 can be realized through a communication bus.

In addition to the components shown in Figure 6, the detection equipment may also include more components, and Figure 6 does not constitute a limitation on its structure.

An embodiment of the present application also provides a computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is run by a computer, the overhang detection of the battery pole piece described in the previous embodiment is performed. method.

In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some communication interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.

In addition, units described as separate components may or may not be physically separated, and components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Furthermore, each functional module in each embodiment of the present application can be integrated together to form an independent part, each module can exist alone, or two or more modules can be integrated to form an independent part.

The above descriptions are only examples of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection scope of this application.

Claims

An Overhang detection method for battery pole pieces, which is characterized by including:

Get an image of the battery pole piece;

Determine the positions of multiple pole piece edges in the image; wherein the multiple pole piece edges are pole piece edges related to the Overhang measurement value corresponding to the image; the position of each pole piece edge is based on the each pole piece edge. The area where the chip edge is located is determined, and the area where each pole piece edge is located is a dynamically determined area;

The Overhang measurement value corresponding to the image is determined according to the positions of the plurality of pole piece edges.
The overhang detection method of battery pole pieces according to claim 1, characterized in that the area where each pole piece edge is located is an area determined based on preset regional parameter information, or based on one or more pole piece edges. location determined area.
The overhang detection method of battery pole pieces according to claim 2, characterized in that the image includes: a first pole piece edge and a second pole piece edge; the area where the first pole piece edge is located is based on a preset The area parameter information of The positional relationship between the edges of the second pole piece.
The overhang detection method of battery pole pieces according to claim 3, characterized in that the image further includes: a third pole piece edge; the area where the third pole piece edge is located is based on the first pole piece edge. The position, the position of the second pole piece edge and the second position relationship are determined; the second position relationship is between the first pole piece edge, the second pole piece edge and the third pole piece edge. positional relationship between them.
The overhang detection method of battery pole pieces according to claim 4, characterized in that the image further includes: a fourth pole piece edge; the area where the fourth pole piece edge is located is based on the first pole piece edge. The position, the position of the second pole piece edge, the position of the third pole piece edge and the third position relationship are determined; the third position relationship is the first pole piece edge, the second pole piece edge The positional relationship between the edge, the edge of the third pole piece and the edge of the fourth pole piece.
The overhang detection method of battery pole pieces according to claim 5, wherein the first pole piece edge is a vertical cathode edge, and the second pole piece edge includes: a vertical anode edge and a horizontal cathode edge, The third pole piece edge includes: a horizontal cathode ceramic edge and a horizontal diaphragm edge, and the fourth pole piece edge is a horizontal anode edge.
The overhang detection method of battery pole pieces according to claim 6, characterized in that determining the measurement value of the overhang corresponding to the image according to the positions of the plurality of pole piece edges includes:

Determine the distance between the cathode ceramic pole piece and the separator based on the position of the horizontal cathode ceramic edge and the position of the horizontal diaphragm edge;

Determine the distance between the anode and the separator based on the position of the horizontal anode edge and the position of the horizontal separator edge;

Determine the first spacing between the cathode and the anode based on the position of the horizontal cathode side and the position of the horizontal anode side;

Determine a second spacing between the cathode and the anode based on the position of the vertical cathode side and the position of the vertical anode side;

Determine the distance between the anode and cathode ceramic pole pieces according to the position of the horizontal anode edge and the position of the horizontal cathode ceramic edge;

Determine the width of the cathode sheet according to the position of the vertical cathode edge;

Determine the width of the anode sheet according to the position of the vertical anode edge;

According to the spacing between the cathode ceramic pole piece and the separator, the spacing between the anode and the separator, the first spacing, the second spacing, the spacing between the anode and the cathode ceramic pole piece, the The cathode plate width and the anode plate width determine the measurement value of Overhang corresponding to the image.
The overhang detection method of the battery pole piece according to claim 1, wherein the image includes multiple images of the battery pole piece, and the multiple images respectively correspond to different areas of the battery pole piece; The above detection methods also include:

The measured value of Overhang corresponding to the battery pole piece is determined based on the measured values of Overhang corresponding to the multiple images and the positional relationship between the different areas.
The overhang detection method of the battery pole piece according to claim 8, wherein the plurality of images respectively correspond to the four corner areas of the battery pole piece.
The overhang detection method of battery pole pieces according to claim 1, characterized in that, for any pole piece edge, the determination process of the position of the pole piece edge includes:

Determine the position of the edge transition point in the area where the pole piece edge is located based on the position of the area where the pole piece edge is located;

The position of the pole piece edge is determined based on the position of the edge transition point and the straight line fitting algorithm.
An Overhang detection device for battery pole pieces, which is characterized by including:

Acquisition module, used to acquire images of battery pole pieces;

A position determination module, used to determine the positions of multiple pole piece edges in the image; wherein the plurality of pole piece edges are pole piece edges related to the Overhang measurement value corresponding to the image; each pole piece edge The position is determined based on the area where each pole piece edge is located, and the area where each pole piece edge is located is a dynamically determined area;

The measurement value determination module is used to determine the Overhang measurement value corresponding to the image according to the positions of the plurality of pole piece edges.
An Overhang testing equipment for battery pole pieces, including:

A processor; and a memory communicatively connected to the processor;

The memory stores instructions executable by the processor, and the instructions are executed by the processor, so that the processor can perform the overhang of the battery pole piece according to any one of claims 1-8. Detection method.
A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is run by a computer, the battery pole piece according to any one of claims 1-8 is executed. Overhang detection method.